package com.lkc.util;

import cn.hutool.crypto.digest.DigestUtil;

public class PasswordUtil {
    private final static char[] arr={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
    private final static int salt_index=5 ;
    private final static int count_index=15;
    public static String getEncryption(String password){
        //随机盐值
        int index_sort = (int)(Math.random()*arr.length);
        char salt = arr[index_sort];
        //随机加密次数
        int index_count = (int)(Math.random()*10);
        char count = arr[index_count];
        String encryptionPassword =password+salt;
        for (int i = 0; i < count; i++) {
            encryptionPassword = DigestUtil.md5Hex(encryptionPassword);
        }
        StringBuilder strb = new StringBuilder(encryptionPassword);
        strb.insert(salt_index, salt);
        strb.insert(count_index, count);
        return strb.toString();
    }
    public static boolean checkPassword(String password,String encryptionPassword){
        //盐值
        char salt = encryptionPassword.charAt(salt_index);
        //加密次数
        char count = encryptionPassword.charAt(count_index);
        String decode = password+salt;
        for (int i = 0; i < count; i++) {
            decode = DigestUtil.md5Hex(decode);
        }
        StringBuilder strb = new StringBuilder(decode);
        strb.insert(salt_index, salt);
        strb.insert(count_index, count);
        return strb.toString().equals(encryptionPassword);
    }

    public static void main(String[] args) {
        String str = getEncryption("123456");
        System.out.println( str);
        System.out.println(checkPassword("123456",str));
    }
}
